Under what circumstances might a couple consult with a genetic counselor?

A) If the woman will be over 35 years of age at the time of birth
B) Couples who are first cousins or other blood relatives
C) Couples who come from ethnic groups in which certain types of genetic defects are more common
D) Couples who have already had a child with a genetic disorder
E) All of these are possible reasons to consult with a genetic counselor.